Manufacture of artificial textiles



Patented Sept. 20, 1932 unirso STATES PATENT OFFICE HARRY IVIEYER, 0F DESSAU, AND WILHELM ELLER, OF BERLIN-WILMEB-SDORF, GER- MANY, ASSIGNORS TO I. G. FABBENINDUSTRIE AKTIENGESELLSCHAFT, OF IERATN'K FORT-ON-THE-MAIN, GERMANY MANUFACTURE OF ARTIFICIAL TEXTILES No Drawing. Application filed May 27, 1929, Seria1 No. 366,517, and in Germany May 31, 1928.

According to our invention we add to the i viscose solution an agent capable of formmg with the viscose solution an emulsion and being capable of forming awatersoluble salt with an acid in the precipitating bath. We prefer to add to the viscose solution an organic base which is insoluble in water but capable of forming an emulsion and of forming a salt with acid constituents in the precipitating bath, for instance, quinoline, ethyl aniline, dimethyl aniline, toluidine, the homologues and substitution products of these compounds; The organic bases may be used pure or in admixture with other compounds, for instance, one may use the'cru'de fractions obtained in the manufacture of the base.

We may add the organic base at any suitable stage in the manufacture of the viscose solution. For example, it may be added to the carbon bisulfide, used to prepare the cellulose xanthogenate, or it may be added to the cellulose xanthogenate formed or it may be mixed with the viscose solution before the spinning operation. For our process, it is essential that a precipitating bath is used possessing a distinctly acid reaction. As stated previously, in this way the baseadded to the viscose solution is converted into a water-soluble salt and dissolved out of the fibers. To ensure uniform'distribution of the added substance, it is desirable to add an emulsifying agent, known in the art, for instance, sulfonated castor oil, sulfonated brown coal tar oil, alkylated naphthalene sulfonic acids.

The quantity of the base to be added de pends on the degree to which it is desired to diminish the luster of the product; it may V be easily determined by experiments. The other steps in the manufacture, forinstance, de-aeration of the viscose, stretching of the our invention.

threads, washing, desulfurizing, bleaching, etc. may be performed in the usual manner.

The following examples serve to illustrate Our invention is, however, not limitedto the exact details given in these examples:

Example 1 I To a viscose solution having a ripeness of 16 to 19 according to Hottenroth, titrated with a solution containing 15% of ammonium chloride, 1, 5% quinoline are added in the.

following manner: to prepare the emulsion we add the whole quantity of quinoline required to the double quantity of viscose, which is mixed with 5 to 10% of an emulsifying agent, for instance, isopropyl naphthalene sulfonic acid. This mixture isemulsified in the usual manner and then mixed with such a quantity of viscose that the resulting spinning solution contains 1,5% of quinoline. I

The evacuated viscose is spun in the usual manner in a precipitating bath containing %3% of sulfuric acid and 30% of sodium sulate. in this way is similar to that of natural silk.

The luster of the threads produced.

- It is obvious that the quinoline used in the example may be added at another stage of the manufacture of the viscose for instance,

it may be added to the alkali cellulose or to the xanthogenate, care being takenthat the base forms a fine emulsion in the finished spinning solution.

E wample 2 in a viscose solution prepared from an alkali cellulose which has ripened for 8 to 4 days and contains 7% of cellulose and 6% of alkali are emulsified 1 to. 2% of commer- Example 3 I in a viscose solution of the same composition as that described in Example 1 in the'pres ence of Turkey red oil in a quantity of calculated on the dimethyl aniline used. The

i8? Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim is 1. The process which comprises incorporating into a viscose solution an organic base capable of forming with the spinning solu tion an emulsion and of orming a Watersoluble salt with the acid constituents of the precipitating bath, emulsifying the organic base in the viscose solution and spinning threads of said viscose solution in an acid precipitating batln 2. The process which comprises incorporating into a viscose solution an organic base capable of forming with the spinning solution an emulsion and of forming a Watersoluble salt with the acid constituents of the precipitating bath and an emulsifying agent emulsifying the organic base in the viscose solution and spinning threads of said viscose solution in an acid precipitating bath.

3. The process which comprises incorporating into a viscose solution an alkylated aniline, emulsifying the said alkylated aniline in the viscose solution and spinning threads of said viscose solution in an acid bath.

4 The process which comprises incorporating into a viscose solution dimethyl' aniline, emulsifying the said dimethyl aniline in the viscose solution and spinning threads of said viscose solution in an acid bath.

5. The process which comprises emulsifying in a viscose solution dimethyl aniline in a quantity of about 1, 5% (calculated on the viscose solution used) in the presence of Turkey red oil and spinning threads of said viscose solution in an acid precipitating bath.

6. The process which comprises incorporating into a viscose solution ethyl-aniline, emulsifying the said ethyl-aniline in the viscose solution and spinning threads of said viscose solution in an acid bath. 7

7. The process which comprises emulsifying in a viscose solution ethyl-aniline in a quantity of 1 to 2% (calculated on the viscose solution used) and spinning threads of said viscose solution in an acid precipitating bath.

SJThe process which comprises incorporating into a viscose solution quinoline, emulsifying the said quinoline in the viscose solution and spinning threads of said viscose solution in an acid bath. 9. The process which comprises emulsifying in a viscose solution quinoline in a quantity of 1.5% (calculated on the viscose solution used) in the presence of isopropyl naphthalene sulfonic acid and spinning threads of said viscose solution in an acid precipi tating bath.

In testimony whereof, we aflix our signatures.

HARRY MEYER. WILHELM ELLER. 

